Can a paternity test be done on a fetus?

Q:Can a DNA test be done on a fetus? If yes, at what month can it be done?

A:Do you mean paternity test to determine who the father is? It can be done after 11 weeks of pregnancy, using DNA technology but one would need the blood of the alleged father to match with the fetus. The difficulty is finding the obstetrician who would take the fetal sample, and the lab who would do the test.